Respuesta :

Banabanana
width = x 
length = 3x

2(x + 3x) = 60
4x = 60/2
4x = 30
x = 30/4
x = 7.5 cm   ← width 

length = 3x = 3 * 7.5 = 22.5 cm
7.5cm x 22.5cm is the answer.